Code example for MarkerObject

 * @author Gavin King 
public class BatchFetchQueue {
	public static final Object MARKER = new MarkerObject( "MARKER" );
	 * Defines a sequence of {@link EntityKey} elements that are currently 
	 * elegible for batch-fetching. 
	 * <p/> 
	 * Even though this is a map, we only use the keys.  A map was chosen in 
	 * order to utilize a {@link LinkedHashMap} to maintain sequencing 
	 * as well as uniqueness. 
	 * <p/> 
	 * TODO : this would be better as a SequencedReferenceSet, but no such beast exists! 
	private final Map batchLoadableEntityKeys = new LinkedHashMap(8);
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